iPadOS 11.3 (build 15E5189f) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-02-20T18:06:17Z. The update package is 293.19 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 468f8f7c06ef8fe75222303f843bbba65fbbac66.zip.